What is the purpose of a rumble strip on the roadway?

Rumble strips serve as an effective auditory and tactile warning system for drivers. They are typically installed along the edges of roadways or in the centerline to alert drivers who may be drifting out of their lane. When a vehicle drives over these strips, the design creates vibrations and noise that can help regain the driver's attention and prevent potential accidents. This function is crucial for enhancing road safety, especially in areas where driver inattention or drowsiness may lead to lane departure.

Other options do not accurately describe the primary purpose of rumble strips. While traction is essential during adverse weather conditions, this is not the role of rumble strips. Similarly, marking the end of a highway or indicating a speed limit change involves signage rather than the use of rumble strips, which are specifically designed for alerting drivers of lane deviations.